<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>媒体查询和布局</title>
  <link rel="stylesheet" href="css/flex04.css">
</head>

<body>

  <div class="container">
    <div>11111</div>
    <div>
      <div style="border: 10px solid #f00;">dddddd</div>
    </div>
    <div>33333</div>
    <div>44444</div>
    <div>55555</div>
    <div>66666</div>
    <div>77777</div>
  </div>

  <div class="desktop">电脑可见</div>
  <div class="phone">手机样式</div>


</body>

</html>